Don Curtis evaluating Douglas-fir tussock moth impact.
Photo by: Unknown
Date: July 1975
Credit: USDA Forest Service, Region 6, State and Private Forestry, Forest Health Protection.
Collection: Region 6, Forest Health Protection slide collection; Regional Office, Portland, Oregon.
For more information about the 1974 project see:
Graham, D.A.; J. Mounts; D. Almas. 1975. 1974 Cooperative Douglas-fir tussock moth control project: Oregon, Washington, Idaho. Portland, OR: USDA Forest Service, Pacific Northwest Region. 74 p.